well, I knew a dude from wow who talked about suicide twice and 2 years later I read on our guildboard that he killed himself (RIP killahra ). So you never know. To me it even sounded like he just was joking around, but in the end it kinda was a cry for help I guess. So all he can do is probably talk to his friend and try to convince him to look for help...and even help him with that. If he reasons with him and he just does not want to seek help...there is not much else that he could do. As sad as this sounds...but I guess there are always some people who you can not help.